Inner tube for pneumatic tires.



AY. I

J. P. BROP INNER TUBE FOR PNEU ATIC TIRES.

Patented Deo. 19, 1916.

R. y M D.. A

Y UNITD STATES lPfmimli OFFICE:

JAMES P. .BROPI-IY, OF,BIRMINGHAM. ALABAMA.

INNER TUBE 'FOR PNEUM'ATIC TIRES.

Specification of Letters Patent. Patented Dec,

Application filed April 1, 1916. Serial No. 88.318.

`is my purpose to proville an inner tube For pneuniatutires whn'h will be eonstruetetl' in sueh manner as to remler the lsame praetieally punt-ture prool' amt whieh. in the event of the liseharg1e ot` the air therefrom. will prevent the eollapsumr ot' the tire as a whole` therebyv preventingr mutilation olvl the.

tire aml prolonring the lit'ethereof when the tire is kept in servit-e after the air has been exhausteil therefrom.

lVith tl above aml other objet-ts in view. thel invention eonsists iii the eonstrm-tion. eonlbination nml arrangement' ol' parts hereinafter set`forth in ainl fallin;r within the Seope ol the claim. Y v

Tn the aeeom|ninying tlrawing: Figure l is a Jr'ragmentary longitudinal seetional view through an inner tube eonstruetetl in aeeorilanee with the present invention. Fig. L is a eross seetional view on tht` line '.Z--L` ot" Fig. l1. Fig. 3 i.' a similar view on the line 3-3 ot Fig. l.

Referring' now to the drawingm tletail.y

1 designates an inner tube 't'or pneumatitI tires of the (louble tube type. ln :u'eorilanee with my present invention. the tubel l is.

tormetl interiorly to provitle a`eireular series of au (',lialnbers 2 separatetl trom one another by n `ans of solul walls 3 tormeil of the. same material as the tuboaml eonneettnl to thev tllbe 1 alnl openingr into one ol the, ehambers L). is an air' valve 4 hereby tho tube may be intlateil. .\ll of t/he ehambers 2, with the exception ot the ehamber provided Vith the. air valve 4.7are, (livitletl by n'leans, of longitudinal partitions 54 into compartments t arranged sitle by sii|e,'an l the compartments (i on eaeh si le ol the tire aro in open eomnnmieation with one another by means of metal tubes 7 passed non-livitletl through openings in thepartitions 3 and the eomparlments t3 eontiguous to the valve ehamber arel in 4open eonnnunieation with the valve ehamber by means of tubes similar to the tubes T. The partitions-5 are malle ot' rubber that is more resilient than the remainingr parts ot' the tire so that such partitions may properly spreatl under the pressure in the tube. 'l`he outer walls of the ehambelts are normally eoneavetl or (lepressed as illustrated in theltlrawitng and when the tube is inllateill` these walls are t'oreeil out as shown by the lottetl lines in the ilrawnn" so that the outer circumference:

ol the tube wil-l present an unbroken tread. \\'hen. however. one ot' the eliainbers or eompartments is puneturetl at the outel wall.l sueh wall innneihawly assumes itsnormal position aml in so tloingl` temls to elose the puneture so as to prevent the eseape of all the air t'rom the ehaznber or eonlpartment.

It will be notetl that the walls ot the ehanlbers are relatively thieh so as to retluee the possibility' ot puneture to a minimum, aint shouhl the tube be .puneture l. aml thel air releaseil therefrom. the walls of the ehalnbers aint eompartlneuts .segregated troni one another will aet to hohl the tube -expamleil to sueh an extent as tol prevent.

mutilation olthe tire when the latter is used without air. i

l elaim: l

.\n inner tube lor pneumatie tires t'ormetl interiorly to provitle an annular series of elnlmbers` al] ot' sai l ehambers ut one beingL` livitletl longitmlinally to form eoinpartntents arranged si le b v siile. the Coinpartm'ents upon eaeh sitle ot' the tire Colnmunieating' with one another anil with the other ehamber. an intlation valve in the ehamber` the outer walls ot' saiil ehamlwrs being` normally eoneaved so that the. rubber may be eompressed upon the intlation ofthe tire to retluee the possibility ot puneture.

ln testimonyv whereolf l allix my signa? ture in presenee ot' two witnesses. y

. JAlYIIS I. BlOlllYv lV i t nesses S. lVurrn, l. J'. TuonN'roN. 

